Grenade Puzzle (Original is Barrel Puzzle by @mread)

I printed the Barrel Puzzle by @mread and loved it. I then had some friends point out that it looked almost like a grenade, but I knew there was no real-world grenade that shared the same form factor and size as this puzzle.... I then remembered the Mills Fragmentation Grenade, the MK2 Grenade, the M61 Grenade and drew my inspiration from this combination.
Print the files from the original Barrel Puzzle, but instead of 2 x part2, print only 1 x part2 and 1 x Part2_Grenade.stl
I designed the gr